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n in (-oo:+oo)
(-1/2)*n = -1/12 // + -1/12
(-1/2)*n-(-1/12) = 0
(-1/2)*n+1/12 = 0
1/12-1/2*n = 0 // - 1/12
-1/2*n = -1/12 // : -1/2
n = -1/12/(-1/2)
n = 1/6
n = 1/6
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